NSO Level 1- Science Olympiad (SOF) Class 8: Questions 515 - 518 of 1175

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Question 515

Question

MCQ▾

Plastic is more durable than metals because

Choices

Choice (4)Response

a.

Plastic do not react with air and water.

b.

It does not undergo correlation easily.

c.

Plastic is non reactive with almost all chemicals.

d.

All a., b. and c. are correct

Question 516

Question

MCQ▾

Identify the polymers from its use

It is used to make various things like mug, drums, syringe, gloves, bags etc

Choices

Choice (4)Response

a.

PVC

b.

Nylon

c.

Polythene

d.

Teflon

Question 517

Question

MCQ▾

The property of Teflon which makes it suitable for using for non stick coating is

Choices

Choice (4)Response

a.

It cannot be recycled

b.

It cannot withstand high temperature

c.

Oil and water do not stick on it

d.

All of the above

Question 518

Question

MCQ▾

Some of the most common blended fabrics are given in the questions. Find out the benefit of the blend over individual fabric.

Categorise the plastic materials in to thermo plastic and thermosetting plastic

Telephone instrument, 2. Plastic toys, 3. Cooker handles, 4. Carry bags, 5. Plastic chairs, 6. Electric switch boards

Choices

Choice (4)Response

a.

1,2, 3 – thermosetting plastic and 4,5, 6 -thermo plastic

b.

1,3, 6 – thermoplastic and 2,4, 5 -thermosetting plastic

c.

1,3, 6 – thermosetting plastic and 2,4, 5 - thermoplastic

d.

1,2, 3 — thermoplastic and 4,5, 6 -thermosetting plastic

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